/*
母串中匹配子串
*/
#include <bits/stdc++.h>
using namespace std;

int fun(string &s1,string &s2){
    int len1=s1.size();
    int len1=s2.size();
    char* s=&s2[0];
    for(int i=0;i<=len1;i++){
        if(s1[i]==*(s+i)){
            
        }
    }
}

int main()
{
    string s1="abcde";
    string s2="cd";

    return 0;
}